feat: Add CalendarSelector component and install new dependencies.

node_modules/better-sqlite3/src/objects/backup.cpp

@@ -0,0 +1,120 @@
+Backup::Backup(
+	Database* db,
+	sqlite3* dest_handle,
+	sqlite3_backup* backup_handle,
+	sqlite3_uint64 id,
+	bool unlink
+) :
+	node::ObjectWrap(),
+	db(db),
+	dest_handle(dest_handle),
+	backup_handle(backup_handle),
+	id(id),
+	alive(true),
+	unlink(unlink) {
+	assert(db != NULL);
+	assert(dest_handle != NULL);
+	assert(backup_handle != NULL);
+	db->AddBackup(this);
+}
+
+Backup::~Backup() {
+	if (alive) db->RemoveBackup(this);
+	CloseHandles();
+}
+
+// Whenever this is used, db->RemoveBackup must be invoked beforehand.
+void Backup::CloseHandles() {
+	if (alive) {
+		alive = false;
+		std::string filename(sqlite3_db_filename(dest_handle, "main"));
+		sqlite3_backup_finish(backup_handle);
+		int status = sqlite3_close(dest_handle);
+		assert(status == SQLITE_OK); ((void)status);
+		if (unlink) remove(filename.c_str());
+	}
+}
+
+INIT(Backup::Init) {
+	v8::Local<v8::FunctionTemplate> t = NewConstructorTemplate(isolate, data, JS_new, "Backup");
+	SetPrototypeMethod(isolate, data, t, "transfer", JS_transfer);
+	SetPrototypeMethod(isolate, data, t, "close", JS_close);
+	return t->GetFunction(OnlyContext).ToLocalChecked();
+}
+
+NODE_METHOD(Backup::JS_new) {
+	UseAddon;
+	if (!addon->privileged_info) return ThrowTypeError("Disabled constructor");
+	assert(info.IsConstructCall());
+	Database* db = Unwrap<Database>(addon->privileged_info->This());
+	REQUIRE_DATABASE_OPEN(db->GetState());
+	REQUIRE_DATABASE_NOT_BUSY(db->GetState());
+
+	v8::Local<v8::Object> database = (*addon->privileged_info)[0].As<v8::Object>();
+	v8::Local<v8::String> attachedName = (*addon->privileged_info)[1].As<v8::String>();
+	v8::Local<v8::String> destFile = (*addon->privileged_info)[2].As<v8::String>();
+	bool unlink = (*addon->privileged_info)[3].As<v8::Boolean>()->Value();
+
+	UseIsolate;
+	sqlite3* dest_handle;
+	v8::String::Utf8Value dest_file(isolate, destFile);
+	v8::String::Utf8Value attached_name(isolate, attachedName);
+	int mask = (SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE);
+
+	if (sqlite3_open_v2(*dest_file, &dest_handle, mask, NULL) != SQLITE_OK) {
+		Database::ThrowSqliteError(addon, dest_handle);
+		int status = sqlite3_close(dest_handle);
+		assert(status == SQLITE_OK); ((void)status);
+		return;
+	}
+
+	sqlite3_extended_result_codes(dest_handle, 1);
+	sqlite3_limit(dest_handle, SQLITE_LIMIT_LENGTH, INT_MAX);
+	sqlite3_backup* backup_handle = sqlite3_backup_init(dest_handle, "main", db->GetHandle(), *attached_name);
+	if (backup_handle == NULL) {
+		Database::ThrowSqliteError(addon, dest_handle);
+		int status = sqlite3_close(dest_handle);
+		assert(status == SQLITE_OK); ((void)status);
+		return;
+	}
+
+	Backup* backup = new Backup(db, dest_handle, backup_handle, addon->NextId(), unlink);
+	backup->Wrap(info.This());
+	SetFrozen(isolate, OnlyContext, info.This(), addon->cs.database, database);
+
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Backup::JS_transfer) {
+	Backup* backup = Unwrap<Backup>(info.This());
+	REQUIRE_ARGUMENT_INT32(first, int pages);
+	REQUIRE_DATABASE_OPEN(backup->db->GetState());
+	assert(backup->db->GetState()->busy == false);
+	assert(backup->alive == true);
+
+	sqlite3_backup* backup_handle = backup->backup_handle;
+	int status = sqlite3_backup_step(backup_handle, pages) & 0xff;
+
+	Addon* addon = backup->db->GetAddon();
+	if (status == SQLITE_OK || status == SQLITE_DONE || status == SQLITE_BUSY) {
+		int total_pages = sqlite3_backup_pagecount(backup_handle);
+		int remaining_pages = sqlite3_backup_remaining(backup_handle);
+		UseIsolate;
+		UseContext;
+		v8::Local<v8::Object> result = v8::Object::New(isolate);
+		result->Set(ctx, addon->cs.totalPages.Get(isolate), v8::Int32::New(isolate, total_pages)).FromJust();
+		result->Set(ctx, addon->cs.remainingPages.Get(isolate), v8::Int32::New(isolate, remaining_pages)).FromJust();
+		info.GetReturnValue().Set(result);
+		if (status == SQLITE_DONE) backup->unlink = false;
+	} else {
+		Database::ThrowSqliteError(addon, sqlite3_errstr(status), status);
+	}
+}
+
+NODE_METHOD(Backup::JS_close) {
+	Backup* backup = Unwrap<Backup>(info.This());
+	assert(backup->db->GetState()->busy == false);
+	if (backup->alive) backup->db->RemoveBackup(backup);
+	backup->CloseHandles();
+	info.GetReturnValue().Set(info.This());
+}

node_modules/better-sqlite3/src/objects/backup.hpp

@@ -0,0 +1,36 @@
+class Backup : public node::ObjectWrap {
+public:
+
+	~Backup();
+
+	// Whenever this is used, db->RemoveBackup must be invoked beforehand.
+	void CloseHandles();
+
+	// Used to support ordered containers.
+	static inline bool Compare(Backup const * const a, Backup const * const b) {
+		return a->id < b->id;
+	}
+
+	static INIT(Init);
+
+private:
+
+	explicit Backup(
+		Database* db,
+		sqlite3* dest_handle,
+		sqlite3_backup* backup_handle,
+		sqlite3_uint64 id,
+		bool unlink
+	);
+
+	static NODE_METHOD(JS_new);
+	static NODE_METHOD(JS_transfer);
+	static NODE_METHOD(JS_close);
+
+	Database* const db;
+	sqlite3* const dest_handle;
+	sqlite3_backup* const backup_handle;
+	const sqlite3_uint64 id;
+	bool alive;
+	bool unlink;
+};

node_modules/better-sqlite3/src/objects/database.cpp

@@ -0,0 +1,417 @@
+const int Database::MAX_BUFFER_SIZE = (
+	node::Buffer::kMaxLength > INT_MAX
+		? INT_MAX
+		: static_cast<int>(node::Buffer::kMaxLength)
+);
+
+const int Database::MAX_STRING_SIZE = (
+	v8::String::kMaxLength > INT_MAX
+		? INT_MAX
+		: static_cast<int>(v8::String::kMaxLength)
+);
+
+Database::Database(
+	v8::Isolate* isolate,
+	Addon* addon,
+	sqlite3* db_handle,
+	v8::Local<v8::Value> logger
+) :
+	node::ObjectWrap(),
+	db_handle(db_handle),
+	open(true),
+	busy(false),
+	safe_ints(false),
+	unsafe_mode(false),
+	was_js_error(false),
+	has_logger(logger->IsFunction()),
+	iterators(0),
+	addon(addon),
+	logger(isolate, logger),
+	stmts(),
+	backups() {
+	assert(db_handle != NULL);
+	addon->dbs.insert(this);
+}
+
+Database::~Database() {
+	if (open) addon->dbs.erase(this);
+	CloseHandles();
+}
+
+// Whenever this is used, addon->dbs.erase() must be invoked beforehand.
+void Database::CloseHandles() {
+	if (open) {
+		open = false;
+		for (Statement* stmt : stmts) stmt->CloseHandles();
+		for (Backup* backup : backups) backup->CloseHandles();
+		stmts.clear();
+		backups.clear();
+		int status = sqlite3_close(db_handle);
+		assert(status == SQLITE_OK); ((void)status);
+	}
+}
+
+void Database::ThrowDatabaseError() {
+	if (was_js_error) was_js_error = false;
+	else ThrowSqliteError(addon, db_handle);
+}
+
+void Database::ThrowSqliteError(Addon* addon, sqlite3* db_handle) {
+	assert(db_handle != NULL);
+	ThrowSqliteError(addon, sqlite3_errmsg(db_handle), sqlite3_extended_errcode(db_handle));
+}
+
+void Database::ThrowSqliteError(Addon* addon, const char* message, int code) {
+	assert(message != NULL);
+	assert((code & 0xff) != SQLITE_OK);
+	assert((code & 0xff) != SQLITE_ROW);
+	assert((code & 0xff) != SQLITE_DONE);
+	EasyIsolate;
+	v8::Local<v8::Value> args[2] = {
+		StringFromUtf8(isolate, message, -1),
+		addon->cs.Code(isolate, code)
+	};
+	isolate->ThrowException(addon->SqliteError.Get(isolate)
+		->NewInstance(OnlyContext, 2, args)
+		.ToLocalChecked());
+}
+
+// Allows Statements to log their executed SQL.
+bool Database::Log(v8::Isolate* isolate, sqlite3_stmt* handle) {
+	assert(was_js_error == false);
+	if (!has_logger) return false;
+	char* expanded = sqlite3_expanded_sql(handle);
+	v8::Local<v8::Value> arg = StringFromUtf8(isolate, expanded ? expanded : sqlite3_sql(handle), -1);
+	was_js_error = logger.Get(isolate).As<v8::Function>()
+		->Call(OnlyContext, v8::Undefined(isolate), 1, &arg)
+		.IsEmpty();
+	if (expanded) sqlite3_free(expanded);
+	return was_js_error;
+}
+
+bool Database::Deserialize(
+	v8::Local<v8::Object> buffer,
+	Addon* addon,
+	sqlite3* db_handle,
+	bool readonly
+) {
+	size_t length = node::Buffer::Length(buffer);
+	unsigned char* data = (unsigned char*)sqlite3_malloc64(length);
+	unsigned int flags = SQLITE_DESERIALIZE_FREEONCLOSE | SQLITE_DESERIALIZE_RESIZEABLE;
+
+	if (readonly) {
+		flags |= SQLITE_DESERIALIZE_READONLY;
+	}
+	if (length) {
+		if (!data) {
+			ThrowError("Out of memory");
+			return false;
+		}
+		memcpy(data, node::Buffer::Data(buffer), length);
+	}
+
+	int status = sqlite3_deserialize(db_handle, "main", data, length, length, flags);
+	if (status != SQLITE_OK) {
+		ThrowSqliteError(addon, status == SQLITE_ERROR ? "unable to deserialize database" : sqlite3_errstr(status), status);
+		return false;
+	}
+
+	return true;
+}
+
+void Database::FreeSerialization(char* data, void* _) {
+	sqlite3_free(data);
+}
+
+INIT(Database::Init) {
+	v8::Local<v8::FunctionTemplate> t = NewConstructorTemplate(isolate, data, JS_new, "Database");
+	SetPrototypeMethod(isolate, data, t, "prepare", JS_prepare);
+	SetPrototypeMethod(isolate, data, t, "exec", JS_exec);
+	SetPrototypeMethod(isolate, data, t, "backup", JS_backup);
+	SetPrototypeMethod(isolate, data, t, "serialize", JS_serialize);
+	SetPrototypeMethod(isolate, data, t, "function", JS_function);
+	SetPrototypeMethod(isolate, data, t, "aggregate", JS_aggregate);
+	SetPrototypeMethod(isolate, data, t, "table", JS_table);
+	SetPrototypeMethod(isolate, data, t, "loadExtension", JS_loadExtension);
+	SetPrototypeMethod(isolate, data, t, "close", JS_close);
+	SetPrototypeMethod(isolate, data, t, "defaultSafeIntegers", JS_defaultSafeIntegers);
+	SetPrototypeMethod(isolate, data, t, "unsafeMode", JS_unsafeMode);
+	SetPrototypeGetter(isolate, data, t, "open", JS_open);
+	SetPrototypeGetter(isolate, data, t, "inTransaction", JS_inTransaction);
+	return t->GetFunction(OnlyContext).ToLocalChecked();
+}
+
+NODE_METHOD(Database::JS_new) {
+	assert(info.IsConstructCall());
+	REQUIRE_ARGUMENT_STRING(first, v8::Local<v8::String> filename);
+	REQUIRE_ARGUMENT_STRING(second, v8::Local<v8::String> filenameGiven);
+	REQUIRE_ARGUMENT_BOOLEAN(third, bool in_memory);
+	REQUIRE_ARGUMENT_BOOLEAN(fourth, bool readonly);
+	REQUIRE_ARGUMENT_BOOLEAN(fifth, bool must_exist);
+	REQUIRE_ARGUMENT_INT32(sixth, int timeout);
+	REQUIRE_ARGUMENT_ANY(seventh, v8::Local<v8::Value> logger);
+	REQUIRE_ARGUMENT_ANY(eighth, v8::Local<v8::Value> buffer);
+
+	UseAddon;
+	UseIsolate;
+	sqlite3* db_handle;
+	v8::String::Utf8Value utf8(isolate, filename);
+	int mask = readonly ? SQLITE_OPEN_READONLY
+		: must_exist ? SQLITE_OPEN_READWRITE
+		: (SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE);
+
+	if (sqlite3_open_v2(*utf8, &db_handle, mask, NULL) != SQLITE_OK) {
+		ThrowSqliteError(addon, db_handle);
+		int status = sqlite3_close(db_handle);
+		assert(status == SQLITE_OK); ((void)status);
+		return;
+	}
+
+	assert(sqlite3_db_mutex(db_handle) == NULL);
+	sqlite3_extended_result_codes(db_handle, 1);
+	sqlite3_busy_timeout(db_handle, timeout);
+	sqlite3_limit(db_handle, SQLITE_LIMIT_LENGTH, MAX_BUFFER_SIZE < MAX_STRING_SIZE ? MAX_BUFFER_SIZE : MAX_STRING_SIZE);
+	sqlite3_limit(db_handle, SQLITE_LIMIT_SQL_LENGTH, MAX_STRING_SIZE);
+	int status = sqlite3_db_config(db_handle, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, NULL);
+	assert(status == SQLITE_OK); ((void)status);
+	status = sqlite3_db_config(db_handle, SQLITE_DBCONFIG_DEFENSIVE, 1, NULL);
+	assert(status == SQLITE_OK); ((void)status);
+
+	if (node::Buffer::HasInstance(buffer) && !Deserialize(buffer.As<v8::Object>(), addon, db_handle, readonly)) {
+		int status = sqlite3_close(db_handle);
+		assert(status == SQLITE_OK); ((void)status);
+		return;
+	}
+
+	UseContext;
+	Database* db = new Database(isolate, addon, db_handle, logger);
+	db->Wrap(info.This());
+	SetFrozen(isolate, ctx, info.This(), addon->cs.memory, v8::Boolean::New(isolate, in_memory));
+	SetFrozen(isolate, ctx, info.This(), addon->cs.readonly, v8::Boolean::New(isolate, readonly));
+	SetFrozen(isolate, ctx, info.This(), addon->cs.name, filenameGiven);
+
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Database::JS_prepare) {
+	REQUIRE_ARGUMENT_STRING(first, v8::Local<v8::String> source);
+	REQUIRE_ARGUMENT_OBJECT(second, v8::Local<v8::Object> database);
+	REQUIRE_ARGUMENT_BOOLEAN(third, bool pragmaMode);
+	(void)source;
+	(void)database;
+	(void)pragmaMode;
+	UseAddon;
+	UseIsolate;
+	v8::Local<v8::Function> c = addon->Statement.Get(isolate);
+	addon->privileged_info = &info;
+	v8::MaybeLocal<v8::Object> maybeStatement = c->NewInstance(OnlyContext, 0, NULL);
+	addon->privileged_info = NULL;
+	if (!maybeStatement.IsEmpty()) info.GetReturnValue().Set(maybeStatement.ToLocalChecked());
+}
+
+NODE_METHOD(Database::JS_exec) {
+	Database* db = Unwrap<Database>(info.This());
+	REQUIRE_ARGUMENT_STRING(first, v8::Local<v8::String> source);
+	REQUIRE_DATABASE_OPEN(db);
+	REQUIRE_DATABASE_NOT_BUSY(db);
+	REQUIRE_DATABASE_NO_ITERATORS_UNLESS_UNSAFE(db);
+	db->busy = true;
+
+	UseIsolate;
+	v8::String::Utf8Value utf8(isolate, source);
+	const char* sql = *utf8;
+	const char* tail;
+
+	int status;
+	const bool has_logger = db->has_logger;
+	sqlite3* const db_handle = db->db_handle;
+	sqlite3_stmt* handle;
+
+	for (;;) {
+		while (IS_SKIPPED(*sql)) ++sql;
+		status = sqlite3_prepare_v2(db_handle, sql, -1, &handle, &tail);
+		sql = tail;
+		if (!handle) break;
+		if (has_logger && db->Log(isolate, handle)) {
+			sqlite3_finalize(handle);
+			status = -1;
+			break;
+		}
+		do status = sqlite3_step(handle);
+		while (status == SQLITE_ROW);
+		status = sqlite3_finalize(handle);
+		if (status != SQLITE_OK) break;
+	}
+
+	db->busy = false;
+	if (status != SQLITE_OK) {
+		db->ThrowDatabaseError();
+	}
+}
+
+NODE_METHOD(Database::JS_backup) {
+	REQUIRE_ARGUMENT_OBJECT(first, v8::Local<v8::Object> database);
+	REQUIRE_ARGUMENT_STRING(second, v8::Local<v8::String> attachedName);
+	REQUIRE_ARGUMENT_STRING(third, v8::Local<v8::String> destFile);
+	REQUIRE_ARGUMENT_BOOLEAN(fourth, bool unlink);
+	(void)database;
+	(void)attachedName;
+	(void)destFile;
+	(void)unlink;
+	UseAddon;
+	UseIsolate;
+	v8::Local<v8::Function> c = addon->Backup.Get(isolate);
+	addon->privileged_info = &info;
+	v8::MaybeLocal<v8::Object> maybeBackup = c->NewInstance(OnlyContext, 0, NULL);
+	addon->privileged_info = NULL;
+	if (!maybeBackup.IsEmpty()) info.GetReturnValue().Set(maybeBackup.ToLocalChecked());
+}
+
+NODE_METHOD(Database::JS_serialize) {
+	Database* db = Unwrap<Database>(info.This());
+	REQUIRE_ARGUMENT_STRING(first, v8::Local<v8::String> attachedName);
+	REQUIRE_DATABASE_OPEN(db);
+	REQUIRE_DATABASE_NOT_BUSY(db);
+	REQUIRE_DATABASE_NO_ITERATORS(db);
+
+	UseIsolate;
+	v8::String::Utf8Value attached_name(isolate, attachedName);
+	sqlite3_int64 length = -1;
+	unsigned char* data = sqlite3_serialize(db->db_handle, *attached_name, &length, 0);
+
+	if (!data && length) {
+		ThrowError("Out of memory");
+		return;
+	}
+
+	info.GetReturnValue().Set(
+		SAFE_NEW_BUFFER(isolate, reinterpret_cast<char*>(data), length, FreeSerialization, NULL).ToLocalChecked()
+	);
+}
+
+NODE_METHOD(Database::JS_function) {
+	Database* db = Unwrap<Database>(info.This());
+	REQUIRE_ARGUMENT_FUNCTION(first, v8::Local<v8::Function> fn);
+	REQUIRE_ARGUMENT_STRING(second, v8::Local<v8::String> nameString);
+	REQUIRE_ARGUMENT_INT32(third, int argc);
+	REQUIRE_ARGUMENT_INT32(fourth, int safe_ints);
+	REQUIRE_ARGUMENT_BOOLEAN(fifth, bool deterministic);
+	REQUIRE_ARGUMENT_BOOLEAN(sixth, bool direct_only);
+	REQUIRE_DATABASE_OPEN(db);
+	REQUIRE_DATABASE_NOT_BUSY(db);
+	REQUIRE_DATABASE_NO_ITERATORS(db);
+
+	UseIsolate;
+	v8::String::Utf8Value name(isolate, nameString);
+	int mask = SQLITE_UTF8;
+	if (deterministic) mask |= SQLITE_DETERMINISTIC;
+	if (direct_only) mask |= SQLITE_DIRECTONLY;
+	safe_ints = safe_ints < 2 ? safe_ints : static_cast<int>(db->safe_ints);
+
+	if (sqlite3_create_function_v2(db->db_handle, *name, argc, mask, new CustomFunction(isolate, db, *name, fn, safe_ints), CustomFunction::xFunc, NULL, NULL, CustomFunction::xDestroy) != SQLITE_OK) {
+		db->ThrowDatabaseError();
+	}
+}
+
+NODE_METHOD(Database::JS_aggregate) {
+	Database* db = Unwrap<Database>(info.This());
+	REQUIRE_ARGUMENT_ANY(first, v8::Local<v8::Value> start);
+	REQUIRE_ARGUMENT_FUNCTION(second, v8::Local<v8::Function> step);
+	REQUIRE_ARGUMENT_ANY(third, v8::Local<v8::Value> inverse);
+	REQUIRE_ARGUMENT_ANY(fourth, v8::Local<v8::Value> result);
+	REQUIRE_ARGUMENT_STRING(fifth, v8::Local<v8::String> nameString);
+	REQUIRE_ARGUMENT_INT32(sixth, int argc);
+	REQUIRE_ARGUMENT_INT32(seventh, int safe_ints);
+	REQUIRE_ARGUMENT_BOOLEAN(eighth, bool deterministic);
+	REQUIRE_ARGUMENT_BOOLEAN(ninth, bool direct_only);
+	REQUIRE_DATABASE_OPEN(db);
+	REQUIRE_DATABASE_NOT_BUSY(db);
+	REQUIRE_DATABASE_NO_ITERATORS(db);
+
+	UseIsolate;
+	v8::String::Utf8Value name(isolate, nameString);
+	auto xInverse = inverse->IsFunction() ? CustomAggregate::xInverse : NULL;
+	auto xValue = xInverse ? CustomAggregate::xValue : NULL;
+	int mask = SQLITE_UTF8;
+	if (deterministic) mask |= SQLITE_DETERMINISTIC;
+	if (direct_only) mask |= SQLITE_DIRECTONLY;
+	safe_ints = safe_ints < 2 ? safe_ints : static_cast<int>(db->safe_ints);
+
+	if (sqlite3_create_window_function(db->db_handle, *name, argc, mask, new CustomAggregate(isolate, db, *name, start, step, inverse, result, safe_ints), CustomAggregate::xStep, CustomAggregate::xFinal, xValue, xInverse, CustomAggregate::xDestroy) != SQLITE_OK) {
+		db->ThrowDatabaseError();
+	}
+}
+
+NODE_METHOD(Database::JS_table) {
+	Database* db = Unwrap<Database>(info.This());
+	REQUIRE_ARGUMENT_FUNCTION(first, v8::Local<v8::Function> factory);
+	REQUIRE_ARGUMENT_STRING(second, v8::Local<v8::String> nameString);
+	REQUIRE_ARGUMENT_BOOLEAN(third, bool eponymous);
+	REQUIRE_DATABASE_OPEN(db);
+	REQUIRE_DATABASE_NOT_BUSY(db);
+	REQUIRE_DATABASE_NO_ITERATORS(db);
+
+	UseIsolate;
+	v8::String::Utf8Value name(isolate, nameString);
+	sqlite3_module* module = eponymous ? &CustomTable::EPONYMOUS_MODULE : &CustomTable::MODULE;
+
+	db->busy = true;
+	if (sqlite3_create_module_v2(db->db_handle, *name, module, new CustomTable(isolate, db, *name, factory), CustomTable::Destructor) != SQLITE_OK) {
+		db->ThrowDatabaseError();
+	}
+	db->busy = false;
+}
+
+NODE_METHOD(Database::JS_loadExtension) {
+	Database* db = Unwrap<Database>(info.This());
+	v8::Local<v8::String> entryPoint;
+	REQUIRE_ARGUMENT_STRING(first, v8::Local<v8::String> filename);
+	if (info.Length() > 1) { REQUIRE_ARGUMENT_STRING(second, entryPoint); }
+	REQUIRE_DATABASE_OPEN(db);
+	REQUIRE_DATABASE_NOT_BUSY(db);
+	REQUIRE_DATABASE_NO_ITERATORS(db);
+	UseIsolate;
+	char* error;
+	int status = sqlite3_load_extension(
+		db->db_handle,
+		*v8::String::Utf8Value(isolate, filename),
+		entryPoint.IsEmpty() ? NULL : *v8::String::Utf8Value(isolate, entryPoint),
+		&error
+	);
+	if (status != SQLITE_OK) {
+		ThrowSqliteError(db->addon, error, status);
+	}
+	sqlite3_free(error);
+}
+
+NODE_METHOD(Database::JS_close) {
+	Database* db = Unwrap<Database>(info.This());
+	if (db->open) {
+		REQUIRE_DATABASE_NOT_BUSY(db);
+		REQUIRE_DATABASE_NO_ITERATORS(db);
+		db->addon->dbs.erase(db);
+		db->CloseHandles();
+	}
+}
+
+NODE_METHOD(Database::JS_defaultSafeIntegers) {
+	Database* db = Unwrap<Database>(info.This());
+	if (info.Length() == 0) db->safe_ints = true;
+	else { REQUIRE_ARGUMENT_BOOLEAN(first, db->safe_ints); }
+}
+
+NODE_METHOD(Database::JS_unsafeMode) {
+	Database* db = Unwrap<Database>(info.This());
+	if (info.Length() == 0) db->unsafe_mode = true;
+	else { REQUIRE_ARGUMENT_BOOLEAN(first, db->unsafe_mode); }
+	sqlite3_db_config(db->db_handle, SQLITE_DBCONFIG_DEFENSIVE, static_cast<int>(!db->unsafe_mode), NULL);
+}
+
+NODE_GETTER(Database::JS_open) {
+	info.GetReturnValue().Set(Unwrap<Database>(info.This())->open);
+}
+
+NODE_GETTER(Database::JS_inTransaction) {
+	Database* db = Unwrap<Database>(info.This());
+	info.GetReturnValue().Set(db->open && !static_cast<bool>(sqlite3_get_autocommit(db->db_handle)));
+}

node_modules/better-sqlite3/src/objects/database.hpp

@@ -0,0 +1,103 @@
+class Database : public node::ObjectWrap {
+public:
+
+	~Database();
+
+	// Whenever this is used, addon->dbs.erase() must be invoked beforehand.
+	void CloseHandles();
+
+	// Used to support ordered containers.
+	class CompareDatabase { public:
+		inline bool operator() (Database const * const a, Database const * const b) const {
+			return a < b;
+		}
+	};
+	class CompareStatement { public:
+		inline bool operator() (Statement const * const a, Statement const * const b) const {
+			return Statement::Compare(a, b);
+		}
+	};
+	class CompareBackup { public:
+		inline bool operator() (Backup const * const a, Backup const * const b) const {
+			return Backup::Compare(a, b);
+		}
+	};
+
+	// Proper error handling logic for when an sqlite3 operation fails.
+	void ThrowDatabaseError();
+	static void ThrowSqliteError(Addon* addon, sqlite3* db_handle);
+	static void ThrowSqliteError(Addon* addon, const char* message, int code);
+
+	// Allows Statements to log their executed SQL.
+	bool Log(v8::Isolate* isolate, sqlite3_stmt* handle);
+
+	// Allow Statements to manage themselves when created and garbage collected.
+	inline void AddStatement(Statement* stmt) { stmts.insert(stmts.end(), stmt); }
+	inline void RemoveStatement(Statement* stmt) { stmts.erase(stmt); }
+
+	// Allow Backups to manage themselves when created and garbage collected.
+	inline void AddBackup(Backup* backup) { backups.insert(backups.end(), backup); }
+	inline void RemoveBackup(Backup* backup) { backups.erase(backup); }
+
+	// A view for Statements to see and modify Database state.
+	// The order of these fields must exactly match their actual order.
+	struct State {
+		const bool open;
+		bool busy;
+		const bool safe_ints;
+		const bool unsafe_mode;
+		bool was_js_error;
+		const bool has_logger;
+		unsigned short iterators;
+		Addon* const addon;
+	};
+
+	inline State* GetState() { return reinterpret_cast<State*>(&open); }
+	inline sqlite3* GetHandle() { return db_handle; }
+	inline Addon* GetAddon() { return addon; }
+
+	static INIT(Init);
+
+private:
+
+	explicit Database(
+		v8::Isolate* isolate,
+		Addon* addon,
+		sqlite3* db_handle,
+		v8::Local<v8::Value> logger
+	);
+
+	static NODE_METHOD(JS_new);
+	static NODE_METHOD(JS_prepare);
+	static NODE_METHOD(JS_exec);
+	static NODE_METHOD(JS_backup);
+	static NODE_METHOD(JS_serialize);
+	static NODE_METHOD(JS_function);
+	static NODE_METHOD(JS_aggregate);
+	static NODE_METHOD(JS_table);
+	static NODE_METHOD(JS_loadExtension);
+	static NODE_METHOD(JS_close);
+	static NODE_METHOD(JS_defaultSafeIntegers);
+	static NODE_METHOD(JS_unsafeMode);
+	static NODE_GETTER(JS_open);
+	static NODE_GETTER(JS_inTransaction);
+
+	static bool Deserialize(v8::Local<v8::Object> buffer, Addon* addon, sqlite3* db_handle, bool readonly);
+	static void FreeSerialization(char* data, void* _);
+
+	static const int MAX_BUFFER_SIZE;
+	static const int MAX_STRING_SIZE;
+
+	sqlite3* const db_handle;
+	bool open;
+	bool busy;
+	bool safe_ints;
+	bool unsafe_mode;
+	bool was_js_error;
+	const bool has_logger;
+	unsigned short iterators;
+	Addon* const addon;
+	const v8::Global<v8::Value> logger;
+	std::set<Statement*, CompareStatement> stmts;
+	std::set<Backup*, CompareBackup> backups;
+};

node_modules/better-sqlite3/src/objects/statement-iterator.cpp

@@ -0,0 +1,113 @@
+StatementIterator::StatementIterator(Statement* stmt, bool bound) :
+	node::ObjectWrap(),
+	stmt(stmt),
+	handle(stmt->handle),
+	db_state(stmt->db->GetState()),
+	bound(bound),
+	safe_ints(stmt->safe_ints),
+	mode(stmt->mode),
+	alive(true),
+	logged(!db_state->has_logger) {
+	assert(stmt != NULL);
+	assert(handle != NULL);
+	assert(stmt->bound == bound);
+	assert(stmt->alive == true);
+	assert(stmt->locked == false);
+	assert(db_state->iterators < USHRT_MAX);
+	stmt->locked = true;
+	db_state->iterators += 1;
+}
+
+// The ~Statement destructor currently covers any state this object creates.
+// Additionally, we actually DON'T want to revert stmt->locked or db_state
+// ->iterators in this destructor, to ensure deterministic database access.
+StatementIterator::~StatementIterator() {}
+
+void StatementIterator::Next(NODE_ARGUMENTS info) {
+	assert(alive == true);
+	db_state->busy = true;
+	if (!logged) {
+		logged = true;
+		if (stmt->db->Log(OnlyIsolate, handle)) {
+			db_state->busy = false;
+			Throw();
+			return;
+		}
+	}
+	int status = sqlite3_step(handle);
+	db_state->busy = false;
+	if (status == SQLITE_ROW) {
+		UseIsolate;
+		UseContext;
+		info.GetReturnValue().Set(
+			NewRecord(isolate, ctx, Data::GetRowJS(isolate, ctx, handle, safe_ints, mode), db_state->addon, false)
+		);
+	} else {
+		if (status == SQLITE_DONE) Return(info);
+		else Throw();
+	}
+}
+
+void StatementIterator::Return(NODE_ARGUMENTS info) {
+	Cleanup();
+	STATEMENT_RETURN_LOGIC(DoneRecord(OnlyIsolate, db_state->addon));
+}
+
+void StatementIterator::Throw() {
+	Cleanup();
+	Database* db = stmt->db;
+	STATEMENT_THROW_LOGIC();
+}
+
+void StatementIterator::Cleanup() {
+	assert(alive == true);
+	alive = false;
+	stmt->locked = false;
+	db_state->iterators -= 1;
+	sqlite3_reset(handle);
+}
+
+INIT(StatementIterator::Init) {
+	v8::Local<v8::FunctionTemplate> t = NewConstructorTemplate(isolate, data, JS_new, "StatementIterator");
+	SetPrototypeMethod(isolate, data, t, "next", JS_next);
+	SetPrototypeMethod(isolate, data, t, "return", JS_return);
+	SetPrototypeSymbolMethod(isolate, data, t, v8::Symbol::GetIterator(isolate), JS_symbolIterator);
+	return t->GetFunction(OnlyContext).ToLocalChecked();
+}
+
+NODE_METHOD(StatementIterator::JS_new) {
+	UseAddon;
+	if (!addon->privileged_info) return ThrowTypeError("Disabled constructor");
+	assert(info.IsConstructCall());
+
+	StatementIterator* iter;
+	{
+		NODE_ARGUMENTS info = *addon->privileged_info;
+		STATEMENT_START_LOGIC(REQUIRE_STATEMENT_RETURNS_DATA, DOES_ADD_ITERATOR);
+		iter = new StatementIterator(stmt, bound);
+	}
+	UseIsolate;
+	UseContext;
+	iter->Wrap(info.This());
+	SetFrozen(isolate, ctx, info.This(), addon->cs.statement, addon->privileged_info->This());
+
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(StatementIterator::JS_next) {
+	StatementIterator* iter = Unwrap<StatementIterator>(info.This());
+	REQUIRE_DATABASE_NOT_BUSY(iter->db_state);
+	if (iter->alive) iter->Next(info);
+	else info.GetReturnValue().Set(DoneRecord(OnlyIsolate, iter->db_state->addon));
+}
+
+NODE_METHOD(StatementIterator::JS_return) {
+	StatementIterator* iter = Unwrap<StatementIterator>(info.This());
+	REQUIRE_DATABASE_NOT_BUSY(iter->db_state);
+	if (iter->alive) iter->Return(info);
+	else info.GetReturnValue().Set(DoneRecord(OnlyIsolate, iter->db_state->addon));
+}
+
+NODE_METHOD(StatementIterator::JS_symbolIterator) {
+	info.GetReturnValue().Set(info.This());
+}

node_modules/better-sqlite3/src/objects/statement-iterator.hpp

@@ -0,0 +1,50 @@
+class StatementIterator : public node::ObjectWrap {
+public:
+
+	// The ~Statement destructor currently covers any state this object creates.
+	// Additionally, we actually DON'T want to revert stmt->locked or db_state
+	// ->iterators in this destructor, to ensure deterministic database access.
+	~StatementIterator();
+
+	static INIT(Init);
+
+private:
+
+	explicit StatementIterator(Statement* stmt, bool bound);
+
+	void Next(NODE_ARGUMENTS info);
+	void Return(NODE_ARGUMENTS info);
+	void Throw();
+	void Cleanup();
+
+	static inline v8::Local<v8::Object> NewRecord(
+		v8::Isolate* isolate,
+		v8::Local<v8::Context> ctx,
+		v8::Local<v8::Value> value,
+		Addon* addon,
+		bool done
+	) {
+		v8::Local<v8::Object> record = v8::Object::New(isolate);
+		record->Set(ctx, addon->cs.value.Get(isolate), value).FromJust();
+		record->Set(ctx, addon->cs.done.Get(isolate), v8::Boolean::New(isolate, done)).FromJust();
+		return record;
+	}
+
+	static inline v8::Local<v8::Object> DoneRecord(v8::Isolate* isolate, Addon* addon) {
+		return NewRecord(isolate, OnlyContext, v8::Undefined(isolate), addon, true);
+	}
+
+	static NODE_METHOD(JS_new);
+	static NODE_METHOD(JS_next);
+	static NODE_METHOD(JS_return);
+	static NODE_METHOD(JS_symbolIterator);
+
+	Statement* const stmt;
+	sqlite3_stmt* const handle;
+	Database::State* const db_state;
+	const bool bound;
+	const bool safe_ints;
+	const char mode;
+	bool alive;
+	bool logged;
+};

node_modules/better-sqlite3/src/objects/statement.cpp

@@ -0,0 +1,383 @@
+Statement::Statement(
+	Database* db,
+	sqlite3_stmt* handle,
+	sqlite3_uint64 id,
+	bool returns_data
+) :
+	node::ObjectWrap(),
+	db(db),
+	handle(handle),
+	extras(new Extras(id)),
+	alive(true),
+	locked(false),
+	bound(false),
+	has_bind_map(false),
+	safe_ints(db->GetState()->safe_ints),
+	mode(Data::FLAT),
+	returns_data(returns_data) {
+	assert(db != NULL);
+	assert(handle != NULL);
+	assert(db->GetState()->open);
+	assert(!db->GetState()->busy);
+	db->AddStatement(this);
+}
+
+Statement::~Statement() {
+	if (alive) db->RemoveStatement(this);
+	CloseHandles();
+	delete extras;
+}
+
+// Whenever this is used, db->RemoveStatement must be invoked beforehand.
+void Statement::CloseHandles() {
+	if (alive) {
+		alive = false;
+		sqlite3_finalize(handle);
+	}
+}
+
+// Returns the Statement's bind map (creates it upon first execution).
+BindMap* Statement::GetBindMap(v8::Isolate* isolate) {
+	if (has_bind_map) return &extras->bind_map;
+	BindMap* bind_map = &extras->bind_map;
+	int param_count = sqlite3_bind_parameter_count(handle);
+	for (int i = 1; i <= param_count; ++i) {
+		const char* name = sqlite3_bind_parameter_name(handle, i);
+		if (name != NULL) bind_map->Add(isolate, name + 1, i);
+	}
+	has_bind_map = true;
+	return bind_map;
+}
+
+Statement::Extras::Extras(sqlite3_uint64 id)
+	: bind_map(0), id(id) {}
+
+INIT(Statement::Init) {
+	v8::Local<v8::FunctionTemplate> t = NewConstructorTemplate(isolate, data, JS_new, "Statement");
+	SetPrototypeMethod(isolate, data, t, "run", JS_run);
+	SetPrototypeMethod(isolate, data, t, "get", JS_get);
+	SetPrototypeMethod(isolate, data, t, "all", JS_all);
+	SetPrototypeMethod(isolate, data, t, "iterate", JS_iterate);
+	SetPrototypeMethod(isolate, data, t, "bind", JS_bind);
+	SetPrototypeMethod(isolate, data, t, "pluck", JS_pluck);
+	SetPrototypeMethod(isolate, data, t, "expand", JS_expand);
+	SetPrototypeMethod(isolate, data, t, "raw", JS_raw);
+	SetPrototypeMethod(isolate, data, t, "safeIntegers", JS_safeIntegers);
+	SetPrototypeMethod(isolate, data, t, "columns", JS_columns);
+	SetPrototypeGetter(isolate, data, t, "busy", JS_busy);
+	return t->GetFunction(OnlyContext).ToLocalChecked();
+}
+
+NODE_METHOD(Statement::JS_new) {
+	UseAddon;
+	if (!addon->privileged_info) {
+		return ThrowTypeError("Statements can only be constructed by the db.prepare() method");
+	}
+	assert(info.IsConstructCall());
+	Database* db = Unwrap<Database>(addon->privileged_info->This());
+	REQUIRE_DATABASE_OPEN(db->GetState());
+	REQUIRE_DATABASE_NOT_BUSY(db->GetState());
+
+	v8::Local<v8::String> source = (*addon->privileged_info)[0].As<v8::String>();
+	v8::Local<v8::Object> database = (*addon->privileged_info)[1].As<v8::Object>();
+	bool pragmaMode = (*addon->privileged_info)[2].As<v8::Boolean>()->Value();
+	int flags = SQLITE_PREPARE_PERSISTENT;
+
+	if (pragmaMode) {
+		REQUIRE_DATABASE_NO_ITERATORS_UNLESS_UNSAFE(db->GetState());
+		flags = 0;
+	}
+
+	UseIsolate;
+	v8::String::Utf8Value utf8(isolate, source);
+	sqlite3_stmt* handle;
+	const char* tail;
+
+	if (sqlite3_prepare_v3(db->GetHandle(), *utf8, utf8.length() + 1, flags, &handle, &tail) != SQLITE_OK) {
+		return db->ThrowDatabaseError();
+	}
+	if (handle == NULL) {
+		return ThrowRangeError("The supplied SQL string contains no statements");
+	}
+	// https://github.com/WiseLibs/better-sqlite3/issues/975#issuecomment-1520934678
+	for (char c; (c = *tail); ) {
+		if (IS_SKIPPED(c)) {
+			++tail;
+			continue;
+		}
+		if (c == '/' && tail[1] == '*') {
+			tail += 2;
+			for (char c; (c = *tail); ++tail) {
+				if (c == '*' && tail[1] == '/') {
+					tail += 2;
+					break;
+				}
+			}
+		} else if (c == '-' && tail[1] == '-') {
+			tail += 2;
+			for (char c; (c = *tail); ++tail) {
+				if (c == '\n') {
+					++tail;
+					break;
+				}
+			}
+		} else {
+			sqlite3_finalize(handle);
+			return ThrowRangeError("The supplied SQL string contains more than one statement");
+		}
+	}
+
+	UseContext;
+	bool returns_data = sqlite3_column_count(handle) >= 1 || pragmaMode;
+	Statement* stmt = new Statement(db, handle, addon->NextId(), returns_data);
+	stmt->Wrap(info.This());
+	SetFrozen(isolate, ctx, info.This(), addon->cs.reader, v8::Boolean::New(isolate, returns_data));
+	SetFrozen(isolate, ctx, info.This(), addon->cs.readonly, v8::Boolean::New(isolate, sqlite3_stmt_readonly(handle) != 0));
+	SetFrozen(isolate, ctx, info.This(), addon->cs.source, source);
+	SetFrozen(isolate, ctx, info.This(), addon->cs.database, database);
+
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Statement::JS_run) {
+	STATEMENT_START(ALLOW_ANY_STATEMENT, DOES_MUTATE);
+	sqlite3* db_handle = db->GetHandle();
+	int total_changes_before = sqlite3_total_changes(db_handle);
+
+	sqlite3_step(handle);
+	if (sqlite3_reset(handle) == SQLITE_OK) {
+		int changes = sqlite3_total_changes(db_handle) == total_changes_before ? 0 : sqlite3_changes(db_handle);
+		sqlite3_int64 id = sqlite3_last_insert_rowid(db_handle);
+		Addon* addon = db->GetAddon();
+		UseContext;
+		v8::Local<v8::Object> result = v8::Object::New(isolate);
+		result->Set(ctx, addon->cs.changes.Get(isolate), v8::Int32::New(isolate, changes)).FromJust();
+		result->Set(ctx, addon->cs.lastInsertRowid.Get(isolate),
+			stmt->safe_ints
+				? v8::BigInt::New(isolate, id).As<v8::Value>()
+				: v8::Number::New(isolate, (double)id).As<v8::Value>()
+		).FromJust();
+		STATEMENT_RETURN(result);
+	}
+	STATEMENT_THROW();
+}
+
+NODE_METHOD(Statement::JS_get) {
+	STATEMENT_START(REQUIRE_STATEMENT_RETURNS_DATA, DOES_NOT_MUTATE);
+	int status = sqlite3_step(handle);
+	if (status == SQLITE_ROW) {
+		v8::Local<v8::Value> result = Data::GetRowJS(isolate, OnlyContext, handle, stmt->safe_ints, stmt->mode);
+		sqlite3_reset(handle);
+		STATEMENT_RETURN(result);
+	} else if (status == SQLITE_DONE) {
+		sqlite3_reset(handle);
+		STATEMENT_RETURN(v8::Undefined(isolate));
+	}
+	sqlite3_reset(handle);
+	STATEMENT_THROW();
+}
+
+NODE_METHOD(Statement::JS_all) {
+	STATEMENT_START(REQUIRE_STATEMENT_RETURNS_DATA, DOES_NOT_MUTATE);
+	UseContext;
+	const bool safe_ints = stmt->safe_ints;
+	const char mode = stmt->mode;
+
+#if !defined(NODE_MODULE_VERSION) || NODE_MODULE_VERSION < 127
+	bool js_error = false;
+	uint32_t row_count = 0;
+	v8::Local<v8::Array> result = v8::Array::New(isolate, 0);
+
+	while (sqlite3_step(handle) == SQLITE_ROW) {
+		if (row_count == 0xffffffff) { ThrowRangeError("Array overflow (too many rows returned)"); js_error = true; break; }
+		result->Set(ctx, row_count++, Data::GetRowJS(isolate, ctx, handle, safe_ints, mode)).FromJust();
+	}
+
+	if (sqlite3_reset(handle) == SQLITE_OK && !js_error) {
+		STATEMENT_RETURN(result);
+	}
+	if (js_error) db->GetState()->was_js_error = true;
+	STATEMENT_THROW();
+#else
+	v8::LocalVector<v8::Value> rows(isolate);
+	rows.reserve(8);
+
+	if (mode == Data::FLAT) {
+		RowBuilder rowBuilder(isolate, handle, safe_ints);
+		while (sqlite3_step(handle) == SQLITE_ROW) {
+			rows.emplace_back(rowBuilder.GetRowJS());
+		}
+	} else {
+		while (sqlite3_step(handle) == SQLITE_ROW) {
+			rows.emplace_back(Data::GetRowJS(isolate, ctx, handle, safe_ints, mode));
+		}
+	}
+
+	if (sqlite3_reset(handle) == SQLITE_OK) {
+		if (rows.size() > 0xffffffff) {
+			ThrowRangeError("Array overflow (too many rows returned)");
+			db->GetState()->was_js_error = true;
+		} else {
+			STATEMENT_RETURN(v8::Array::New(isolate, rows.data(), rows.size()));
+		}
+	}
+	STATEMENT_THROW();
+#endif
+}
+
+NODE_METHOD(Statement::JS_iterate) {
+	UseAddon;
+	UseIsolate;
+	v8::Local<v8::Function> c = addon->StatementIterator.Get(isolate);
+	addon->privileged_info = &info;
+	v8::MaybeLocal<v8::Object> maybeIterator = c->NewInstance(OnlyContext, 0, NULL);
+	addon->privileged_info = NULL;
+	if (!maybeIterator.IsEmpty()) info.GetReturnValue().Set(maybeIterator.ToLocalChecked());
+}
+
+NODE_METHOD(Statement::JS_bind) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	if (stmt->bound) return ThrowTypeError("The bind() method can only be invoked once per statement object");
+	REQUIRE_DATABASE_OPEN(stmt->db->GetState());
+	REQUIRE_DATABASE_NOT_BUSY(stmt->db->GetState());
+	REQUIRE_STATEMENT_NOT_LOCKED(stmt);
+	STATEMENT_BIND(stmt->handle);
+	stmt->bound = true;
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Statement::JS_pluck) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	if (!stmt->returns_data) return ThrowTypeError("The pluck() method is only for statements that return data");
+	REQUIRE_DATABASE_NOT_BUSY(stmt->db->GetState());
+	REQUIRE_STATEMENT_NOT_LOCKED(stmt);
+	bool use = true;
+	if (info.Length() != 0) { REQUIRE_ARGUMENT_BOOLEAN(first, use); }
+	stmt->mode = use ? Data::PLUCK : stmt->mode == Data::PLUCK ? Data::FLAT : stmt->mode;
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Statement::JS_expand) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	if (!stmt->returns_data) return ThrowTypeError("The expand() method is only for statements that return data");
+	REQUIRE_DATABASE_NOT_BUSY(stmt->db->GetState());
+	REQUIRE_STATEMENT_NOT_LOCKED(stmt);
+	bool use = true;
+	if (info.Length() != 0) { REQUIRE_ARGUMENT_BOOLEAN(first, use); }
+	stmt->mode = use ? Data::EXPAND : stmt->mode == Data::EXPAND ? Data::FLAT : stmt->mode;
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Statement::JS_raw) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	if (!stmt->returns_data) return ThrowTypeError("The raw() method is only for statements that return data");
+	REQUIRE_DATABASE_NOT_BUSY(stmt->db->GetState());
+	REQUIRE_STATEMENT_NOT_LOCKED(stmt);
+	bool use = true;
+	if (info.Length() != 0) { REQUIRE_ARGUMENT_BOOLEAN(first, use); }
+	stmt->mode = use ? Data::RAW : stmt->mode == Data::RAW ? Data::FLAT : stmt->mode;
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Statement::JS_safeIntegers) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	REQUIRE_DATABASE_NOT_BUSY(stmt->db->GetState());
+	REQUIRE_STATEMENT_NOT_LOCKED(stmt);
+	if (info.Length() == 0) stmt->safe_ints = true;
+	else { REQUIRE_ARGUMENT_BOOLEAN(first, stmt->safe_ints); }
+	info.GetReturnValue().Set(info.This());
+}
+
+NODE_METHOD(Statement::JS_columns) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	if (!stmt->returns_data) return ThrowTypeError("The columns() method is only for statements that return data");
+	REQUIRE_DATABASE_OPEN(stmt->db->GetState());
+	REQUIRE_DATABASE_NOT_BUSY(stmt->db->GetState());
+	Addon* addon = stmt->db->GetAddon();
+	UseIsolate;
+
+#if !defined(NODE_MODULE_VERSION) || NODE_MODULE_VERSION < 127
+	UseContext;
+	int column_count = sqlite3_column_count(stmt->handle);
+	v8::Local<v8::Array> columns = v8::Array::New(isolate);
+
+	v8::Local<v8::String> name = addon->cs.name.Get(isolate);
+	v8::Local<v8::String> columnName = addon->cs.column.Get(isolate);
+	v8::Local<v8::String> tableName = addon->cs.table.Get(isolate);
+	v8::Local<v8::String> databaseName = addon->cs.database.Get(isolate);
+	v8::Local<v8::String> typeName = addon->cs.type.Get(isolate);
+
+	for (int i = 0; i < column_count; ++i) {
+		v8::Local<v8::Object> column = v8::Object::New(isolate);
+
+		column->Set(ctx, name,
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_name(stmt->handle, i), -1)
+		).FromJust();
+		column->Set(ctx, columnName,
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_origin_name(stmt->handle, i), -1)
+		).FromJust();
+		column->Set(ctx, tableName,
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_table_name(stmt->handle, i), -1)
+		).FromJust();
+		column->Set(ctx, databaseName,
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_database_name(stmt->handle, i), -1)
+		).FromJust();
+		column->Set(ctx, typeName,
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_decltype(stmt->handle, i), -1)
+		).FromJust();
+
+		columns->Set(ctx, i, column).FromJust();
+	}
+
+	info.GetReturnValue().Set(columns);
+#else
+	v8::LocalVector<v8::Name> keys(isolate);
+	keys.reserve(5);
+	keys.emplace_back(addon->cs.name.Get(isolate).As<v8::Name>());
+	keys.emplace_back(addon->cs.column.Get(isolate).As<v8::Name>());
+	keys.emplace_back(addon->cs.table.Get(isolate).As<v8::Name>());
+	keys.emplace_back(addon->cs.database.Get(isolate).As<v8::Name>());
+	keys.emplace_back(addon->cs.type.Get(isolate).As<v8::Name>());
+
+	int column_count = sqlite3_column_count(stmt->handle);
+	v8::LocalVector<v8::Value> columns(isolate);
+	columns.reserve(column_count);
+
+	for (int i = 0; i < column_count; ++i) {
+		v8::LocalVector<v8::Value> values(isolate);
+		keys.reserve(5);
+		values.emplace_back(
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_name(stmt->handle, i), -1)
+		);
+		values.emplace_back(
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_origin_name(stmt->handle, i), -1)
+		);
+		values.emplace_back(
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_table_name(stmt->handle, i), -1)
+		);
+		values.emplace_back(
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_database_name(stmt->handle, i), -1)
+		);
+		values.emplace_back(
+			InternalizedFromUtf8OrNull(isolate, sqlite3_column_decltype(stmt->handle, i), -1)
+		);
+		columns.emplace_back(
+			v8::Object::New(isolate,
+				GET_PROTOTYPE(v8::Object::New(isolate)),
+				keys.data(),
+				values.data(),
+				keys.size()
+			)
+		);
+	}
+
+	info.GetReturnValue().Set(
+		v8::Array::New(isolate, columns.data(), columns.size())
+	);
+#endif
+}
+
+NODE_GETTER(Statement::JS_busy) {
+	Statement* stmt = Unwrap<Statement>(info.This());
+	info.GetReturnValue().Set(stmt->alive && stmt->locked);
+}

node_modules/better-sqlite3/src/objects/statement.hpp

@@ -0,0 +1,58 @@
+class Statement : public node::ObjectWrap { friend class StatementIterator;
+public:
+
+	~Statement();
+
+	// Whenever this is used, db->RemoveStatement must be invoked beforehand.
+	void CloseHandles();
+
+	// Used to support ordered containers.
+	static inline bool Compare(Statement const * const a, Statement const * const b) {
+		return a->extras->id < b->extras->id;
+	}
+
+	// Returns the Statement's bind map (creates it upon first execution).
+	BindMap* GetBindMap(v8::Isolate* isolate);
+
+	static INIT(Init);
+
+private:
+
+	// A class for holding values that are less often used.
+	class Extras { friend class Statement;
+		explicit Extras(sqlite3_uint64 id);
+		BindMap bind_map;
+		const sqlite3_uint64 id;
+	};
+
+	explicit Statement(
+		Database* db,
+		sqlite3_stmt* handle,
+		sqlite3_uint64 id,
+		bool returns_data
+	);
+
+	static NODE_METHOD(JS_new);
+	static NODE_METHOD(JS_run);
+	static NODE_METHOD(JS_get);
+	static NODE_METHOD(JS_all);
+	static NODE_METHOD(JS_iterate);
+	static NODE_METHOD(JS_bind);
+	static NODE_METHOD(JS_pluck);
+	static NODE_METHOD(JS_expand);
+	static NODE_METHOD(JS_raw);
+	static NODE_METHOD(JS_safeIntegers);
+	static NODE_METHOD(JS_columns);
+	static NODE_GETTER(JS_busy);
+
+	Database* const db;
+	sqlite3_stmt* const handle;
+	Extras* const extras;
+	bool alive;
+	bool locked;
+	bool bound;
+	bool has_bind_map;
+	bool safe_ints;
+	char mode;
+	const bool returns_data;
+};